Furnace.



G. A. CARLBTON.

FURNACE.

APPLICATION FILED MAR. 30, 1910.

Patented Sept 6,1910.

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ATTORNEYS O. A. GARLBTON.

FURNACE.

APPLICATION FILED MAB-.30, 1910.

Patented Sept. 6,1910.

2 SHEETS-SHEET 2.

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ATTORNEYS 15H: cm, wunmoron, u. c.

UNITED STATES PATENT OFFICE.

CHARLES A. CARLETON, OF CUMBERLAND MILLS, MAINE, ASSIGNOR OF ONE-HALF TOWILLIAM G. MGCLIN'IOCK, 0F BOOTH BAY HARBOR, MAINE.

FURNACE.

Specification of Letters Patent.

Application Filed March 30, 1910.

Patented Sept. 6, 1910.

Serial No. 552,295.

To all whom it may concern:

Be it known that I, CHARLES A. CARLn'roN, a citizen of the UnitedStates, and a resident of Cumberland Mills, in the county of Cumberlandand State of Maine, have invented a new and Improved Furnace, of whichthe following is a full, clear, and exact description.

This invention relates to furnaces used in connection with boilers andthe like, and has reference more particularly to a furnace in which thegrate has associated therewith an adjustable stop for limiting themovement of the fuel bed.

The object of the invention is to provide a simple and efficient furnacefor use in connection with steam boilers and the like, in which the fuelbed formed by the mass of burning coal 01' other combustible isgradually moved into the furnace, by means of a mechanical stoker or inany other man nor, in which the movement of the fuel bed is limited, toprevent unconsumed fuel from falling into the ash pit, in which the movement of the ash to the ash pit is not hindered, in which the stop can beeasily adjusted, and in which certain of the parts when worn out can bereplaced without ditliculty and without interfering with the operationof the furnace.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views, and in which- Figure 1 is alongitudinal section of part of a furnace having an embodiment of myinvention applied thereto; Fig. 2 is a trans verse section of thefurnace having parts broken away; Fig. 3 is an enlarged, front elevationof a part of the furnace, showing one of the stops and the means formounting it in position; Fig. t is a perspective view of one of thesaddles used for mounting the stops in position; and Fig. 5 is aperspective view of a housing or slide hearing used for adjustablycarrying the stops.

Before proceeding to a more detailed explanation of my invention, itshould be clearly understood that while the invention is particularlyuseful in connection with furnaces having mechanical stokers of thechain-grate type, it can also be advantageously employed with otherfurnaces in which the fuel bed is gradually moved toward the rear of thefurnace, mechanically or otherwise. The stops may be of any suitablenumber, depending upon the size of the furnace. They are arranged at therear end of the grate, and spaced slightly above the same, so that theyserve to limit the movement of the unconsumed fuel of the fuel-bed,while permitting the lower layers of ash to pass under them, into theash pit. By preventing unconsumed fuel from falling into the ash pit, aconsiderable economy is elfected, and needless waste of fuel isobviated. The stops are adjustable and -an be withdrawn to permitclinkers to pass into the ash pit should the fuel bed include suchaggregations of material.

In connection with my invention, I provide suitable means for supportingthe bridge wall of the furnace and the fire-brick covering connectingthe bridge-wall and the flame bed, as will appear more clearlyhereinafter.

ertain of the details of construction form no part of the invention, andcan be varied in accan'dance with individual preference and specialconditions, without departing from the underlying spirit of theinvention.

Referring more l'nirticularly to the drawings, I have shown, forexample, a furnace of a boiler 10, having a chain-grate 11 terminatingat the rear or other fuel is fed to the grate at the front of the boilerin the usual manner, and gradually progresses with the movement of thegrate, to the ash pit. The side walls 13 of the furnace, at the rear endof the g 'ate are provided with inwardly extending plate carriers 14,upon which are mounted housin s or slide bearings '15.- These arepreferably fashioned from cast metal and comprise rectangular framesconsisting of upper and lower members 16 and 17, and end members 18 and19. The end members 19, at the upper corners are inwardly offset to formseats 20 for a bridge wall support 21, which is of L cross-section, andcarries the bridge wall 22. The support, it. will be understood, extendstransversely of the furnace, from one of the housings to the other. Theupper members 16 of the housings also carry T-iron above the ash pit 12.Coat cross bars 23, which serve to support the cover 24; of fire-brickor the like, which con: nects the bridge-wall and the flame-bed of thefurnace.

The lower members 17 of the housings constitute bearing surfaces for aslidable, transverse slide bar carrier 25 which 1s of angular crosssection, and has upwardly offset bearing ends 26 which rest movably uponthe bearing surfaces 17 of the bearings 15. The lower members 17 haveupwardly d1sposed flanges 27 at their outer edges, whlch serve toprevent the lateraldisplacement of the carrier 25. Bearings 28 aremounted upon the ends 26 of the carrier, and have journaled therein ashaft 29. Thls extends at one end through an opening 30 111 one of theside walls of the furnace, and at the projecting end is provided with ahand wheel 31 by means of which it can be manipulated. The shaft haskeyed or otherwise rigidly secured thereon, within the housings 15,gears 32 which mesh with racks 33 secured at the under sides of theupper members 16 of the housings. The provision of the gearing permitsthe carrier to be moved longitudinally of the housings when the shaft isrotated by means of the hand wheel I employ a plurality of saddles 3 1having laterally disposed, upper portions 35 provided with downwardlyextending retaining flanges 3G by means of which the saddles can beremovably mounted upon the slide carrier, the upwardly disposed web 37of the carrier being received between the flanges 36 and the body of thesaddles, so that the laterally extended parts 35 thereof seat upon theupper edge of the web as is shown most clearly in Fig. 1. The saddleshave downwardly tapered; undercut or dovetailed grooves 38 which receivethe correspond ingly formed rear ends 39 of the stops 40. These consistof elongated members having strengthening webs L1, and notched orserrated ends 42 which are downwardly ex- "tended and normallypositioned above the rear end of the chain-grate. The ends 12 are spacedabove the grate a distance such that the lower layers of ash can bepassed under them, and fall into the ash pit, while the ends areoperative to prevent the movement of the unconsumed fuel over the end ofthe chain-grate. They therefore act as stops to limit the movement ofthe fuel bed.

The stops can be easily replaced when worn out, by moving the carrierback as far as possible from the grate. Owing to the upward draftthrough the furnace, the ash pit is comparatively cool, and it ispossible for a person to have access through the opening 30 to removeand replace the stops when the carrier is retracted. A pair of tongs isall that is necessary for this operation. It does not interfere with the.working of the furnace, and can be effected in a very short time. Thewithdrawal of the stops from the end of the furnace also permitsclinkers to be advanced into the ash pit. As soon as the clinker hasfallen over the end of the grate the stops can be returned to theiroperative positions.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent:

1. In a furnace, an ash pit, bearings, a movable grate adapted to carrythe fuel bed toward said ash pit, a movable stop carrier located in saidfurnace and supported by said bearings, and a manually-operable membersupported upon said carrier and in operative engagement with saidbearings,

whereby it can be actuated from the outsideof the furnace, to adjustsaid carrier toward and away from said grate, said carrier having meansfor limiting the movement of the fuel bed.

2. In a furnace, a movable grate, an ash pit at the rear thereof,bearing housings at each side of said furnace adjacent to said ash pit,a carrier slidably engaging said housings, and having a plurality ofstops, a shaft journaled upon said carrier and pro jecting to theoutside of the furnace, said shaft at the projecting end having meanspermitting its manipulation, a gear rigid with said shaft, and a fixedrack in mesh with said gear.

3. In a furnace, a movable grate, an ash pit at the rear thereof,bearing housings at each side of said furnace adjacent to said ash pit,said housings comprising rectangular frames having upper and lowermembers, end members inwardly ofiset to form seats, a bridge wallsupported upon said seats, said lower members of said housingsconstituting bearing surfaces and having upwardlydisposed flanges attheir outer edges, a carrier slidably mounted on said lower members ofsaid housings between said flanges and having a plurality of stops, ashaft j ournaled upon said carrier and projecting to the outside of thefurnace, said shaft at the projecting end having means permitting itsmanipulation, and gears rigid with said shaft, said housings havingfixed racks in mesh with said gears.

4. In a furnace, a movable grate, bearing housings at the sides of thefurnace, a support extending transversely of said housings, a bridgewall carried by said support, a further support carried by said housingsand extending transversely of the furnace, a covering wall carried bysaid other support and extending to said bridge wall, and an adjustablestop supported by said housings and serving to limit the fuel bed.

5. In a furnace, a movable grate, a carrier adjustably mounted adjacentto said grate, saddles mounted upon said carrier, and stops carried bysaid saddles.

6. In a furnace, a movable grate, a mov- In testimony whereof I havesigned my able carrler poslt-loned adprcent to sand name to HHS smelficatlon 1n the presence of 10 grate, saddles removably mounted uponszud two subscrlblng WltllQSSCS.

earner and havln retalnln fldn es e1 a CHARLES 1L CARLETON. mg the same,each of sald saddles havlng a dovetzuled groove, and stops havlng partsW1tnesses:

removably mounted 1n szud dovetalled BER'IHA \V. KNIGHT,

grooves. V. M. LAMB.

